Oven heat-control device



il 5 1927. Apr E. L.'CLAUS- ET AL OVEN HEAT CONTROL DEVICE Fi led Jan. 24. s Sheets-Sheet 1 April 5, 1927. 1,623,576

E. L.-CLAUS L OVENHEAT CONTROL'DEVICE Filed a 24. 1921 s Sheets-SheetE Patented Apr. 5, 1927.

UNITED STATES PATENT OFFICE.

EMIL L. CLAUS AND WALTER E. CLAUS. OF MILWAUKEE, WISCONSIN, ASSIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, TO MILWAUKEE GAS SPECIALTY COM-- PANZY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

OVEN HEAT-CONTROL DEVICE.

Application filed January 24, 1921. Serial No. 439,470.

This invention relates to certain-new and useful improvements in ovens and refers more particularly to thermostatic means for regulating the heat thereof.

At the present time, all of the variousdevices applied. to ovens for regulating the heat thereof include bulky mechanism. attached to the exterior thereof, which is objectionable in that parts of the regulator are subjected to the heat of the oven andparts are outside the influence of the oven heat, whiclrinterfcres with the efficient operation thereof. I

With the above and other objections in mind to the existing structures of this char? acter it is one of the objects of the present invention to provide an oven regulating device in which the partsthereof are all concealed within the "interior thereof.

' Another-object of this invention is to provide an oven heat regulating device which is so constructed and designed that a novice can readily apply the same to any oven, the parts bein so designed and constructedas to be proo against wrong assembly.

'A further object-.of this invention is to provide a heat regulating device for cooking ovens in which all additional fixtures are eliminated and in which the control valve for governing the supplyof gas to the burner is located at the end of the usual stringer pipe thus eliminating the necessity of expensive fixtures in applying the same.

A further object of the present invention is to provide a device of the class described in which three separate means of adjustment are provided for convenience in assembling the same.

A still further object of this invention is to provide radiating fins or ribs adjacent the heat sensitive or thermostatic member proper whereby buckling or contraction and expansion of that part of the oven there adjacentis eliminated.

With the above and other objects in View which will appear as the description proceeds this invention resides in the novel combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of theherein disclosed invention may be made as come within the scope of the claims.

Inthe accompanying drawings we have illustrated one complete example of the physical embodiment of our invention constructed according'to the best mode we have so far devised for the practical application of the principles thereof in which:

Figure 1 is a front view of a cooking oven equipped with our improved heat regulatmg device, parts thereof being broken away and in section to more clearly illustrate deta ls of construction;

F1gure 2 is a fragmentary perspective view taken through the upper front portion of the oven and the temperature sensitive member on the line 22 of Figure 1;

Figure 3 is a view. part in section and part n top plan, said view being taken on the plane of line 3-3 of Figure 1;

' Figure 4 is a fragmentary detail view part in section and part in elevation and taken through Figure 3 on the line l4;

F gure 5 is a fragmentary view part in section and part in elevation taken on the line 55 of Figure 3;

Figure 6 is a detail sectional view taken through Figure 1 onthe line 6.6;

Figure 7 is a sectional view' taken longitudinally through the as sn 1 valve on the line 7-7 of Figure Ei; pp y Figure 8 is a transverse sectional view taken through Figure 7 on the line 8-8;

Figure 9 is a rear elevational View of the guard carrying setting dial and pointer car V merals designate like parts throughout the several views, the numeral 1 designates a portion of the framework of a gas range or stove having a heating oven or other com partment 2 mounted on one end thereof and provided with a burner B which is connected with the usual stringer pipe 3 in the manner hereinafter described. Secured within theoven 2, preferably adjacent its front upper corner is a heat sensitive bar or rod 4 preferably constructed of brass tubing or any other material having a high coefficient of expansion and said rod has one end rigidly secured to the front 5 of the oven by a securing bolt 6 which passes therethrough and binds the same between a washer 7 and a spacing block 7. The other end of said rod is free and provided with interior screw-threads in which is adjustably received the threaded end 8 of a bifurcated member 9. The rod 4 is preferably horizontally positioned and pivotally secured by a pivot 9' between the ends of the bifurcated member 9 carried thereby is a crank arm 10 which is fixed to the upper end of a substantially vertically disposed shaft 11, the member 9 providing an adjustable connection between rod 4 and shaft 11.

The shaft 11 is rotatably mounted in bearing members 12 carried by a channel bar or length of channel iron 13 which is provided with apertures adjacent each end for receiving securing bolts 14 for firmly fastening the same to the inner wall of the oven, see Figures 1, 3 and 6. The bolts that secure the channel iron in place also preferably serve to secure the bearing members 12 in position, and by this construction the attachment of the parts to the oven is considerably simplified as all that is required is that the adjacent oven walls be drilled to register with the openings in said channel irons.

Secured to the lower end of the shaft 11 is an arm 15 which passes outwardly from the oven interior through an opening 16 and has its free end 17 counterbored or recessed to slidably receive the shank 18 of a forked member 19. The forked ends of said member are provided with inwardly extended pins 20 which are pivotally engaged within recesses in a threaded nut 21 mounted on the threaded end 22 of a later described. The valve member 23 is slidably mounted in a valve casing 24 having a central chamber 25 and an inlet port 26 communicating the same with a counterbored internally threaded portion 27 in which the adjacent end of stringer pipe 3 is engaged. The inner end of the valve member 23 has a snug sliding fit in the port 26 and the outer end portion thereof. passes through an opening 28 in the outer end of the casing 24, said casing being counter-bored where the valve member passes outwardly thereof to receive suitable packing material 29 which is held in place by a nut30 to prevent the escape of fuel therepast.

The inner end of the valve member 23 is recessed or counterbored as at 31 and the valve member 23 to be the pivot 44 and supply of fuel into the chamber 25 is cut off and in order to prevent the burners from being completely extinguished in the event. that the heat-regulating device should be fully expanded, we provide a by-pass 35 which connects the stringer pipe 3 with the chamber 25 through the partition 25 separating the chamber from bore 27, said bypass bein adjustable by a setsere\v 36.

Secured to the extreme outer end 17 of the arm 15 is a block 37 which adjustably carries a shield or guard member 38, one edge 39 of which is struck on an arc and has its outer face provided with graduations representing various degrees of temperature. The shield 38 is connected with said blocks by two screws 40 carried by a connecting member 41 and passing through an elongated recess 42 in the adjacent portion of the plate and having a threaded engagement with said block 37 to bind the plate 38 between the connecting member 41 and block 37. A pointer 43 is pivotally secured to plate 38 at substantially the center from which the edge 39 is struck by a pivot 44. Said pointer carries an adjustable extension 45 upon the inner end of which is secured a pin 46 for engagement in an annular groove 47 of a knurled head or nut 48 fixed to the threaded end of the valve member 23. The extension 45 is longitudinally slotted throughout substantially its entire length as at 49 to receive the extended end of pivot 44 and a binding screw 50 having threaded engagement with said pointer whereby the distance between pin 46 may be adjusted to set pointer 43.

The general operation of our improved device is substantially as follows:

Assuming that the various parts have been properly adjusted for the oven upon which they are applied, should the operator desire to maintain the oven temperature at 200, the nut 48 is adjusted to set the valve member 23 at the point where the pointer 43 will be in register with the 200 line (see Figure 3), this setting of the valve member swinging the pointer on its pivot by reason of its connection in the groove 47 through the pin 46 of the extension 45;'

As the temperature of the oven increases the rod 4 is expanded increasing the distance between the center of the pivotal connection of the crank with the free end thereof and its point of rigid connection with the oven,- as a result of which the shaft 11 is rotated in the direction of the arrow in Figure 3, swinging the free end 1*7of arm 15 in the direction of the arrow 51. This movement of arm 15 slides the valve member 23 into the valve casing by reason of its connect-ion therewith through the nut'21, decreasing the space between the inner end of port- 26 and the inner ends of slots 32. In the event that the expansion of the 'rod 4 the port 26 and chamber 25 and thus increasing the volume of fuel supplied to the burners.

The present device may be readily applied to ovens now in use as the only work necessary to the installation thereofis the drilling'of three openings in the front face of the oven'to accommodate the securing bolts 6 and 14 and the cutting of the opening 16 through which the arm 15 projects. By reason of the shaft llbeing carried by the chan nel member 13 the device is made substantially fool-proof so that any novice can apply the same. The shaft 11 is preferably of tapered form with its medial portion of larger diameter than its, ends to overcome any. torsional stress resulting from the. stick ing of any of the parts of the instrument.

In thefconstruction of ovens to be. equipped with our invention, the outer wallfthereof adjacent the bar. 4 is preferably provided with a pluralitypf- .radiating-fins52 which carry off the heat of that portion of the oven, to which the rodi i is secured and eliminate. the possibility of the eipansion thereof to thus interfere with the operation of the re'gulatingdeviceby retaining the distance between the channel'member 13 and the point of securement of the rod 4 with the oven substantialLy the same irrespective of the heat of the oven.

From the foregoing description taken in connection with the accompanying drawings it Will be readily apparent to those skilled in a device of the class described that we provide a heat-regulating device for'an oven in which all the parts thereof are substantially completely enclosed within the oven, which may be readily appliedto ovens now in use or to ovens at the time of their manufacture, which require no additional fittings inapplying the same, the valve mechanism being at- -combination of an oven havin tachable at the end of the usual stringer rate means of adjustment.

WVe claim:

1. In a device of the class described, the a burner, a valve for controlling the supp y of fuel to said burner, said valve having a movable controlling element, a heat responsive device positioned within the oven, an arm connect ed with said device, an adjustable connection between the movable element of the valve and the arm whereby the valve is adjustable for a desired temperature, and said movable element moving upon the expansion and contraction of the heat responsive device under temperature changes to control the flow of fuel to the burner and maintain the temperature .within the oven substantially at the desired degree.

7 2. In a device of the class described, .the combination of an oven having a burner, a valve for controllingthe supply offuel to said burner, a control device positioned within the oven.for governing the temperature of the same, said control device including a heat responsive rod, a bracket secured within said oven, a shaft rotatably carried by said bracket, a connection between said shaft and rod whereby a contraction or expansion of said rod will rotate said shaft, a connection between said shaft and valve for con-' trolling the same, adjustable means for regulating the valve independent of said connection, and indicating means controlled by the adjustable means for indicating the temperature desired.

Y 3. In a device of the character described adapted for application to a gas range having an oven and a stringer pipe on the outside thereof, the combination with a valve casing adapted for connection with the stringer'pipe to receive support therefrom? valve means in the casing, means sensitive to temperature changes located within? the oven, an actuating connection betweenlfi'fhe meanssensitive to temperature changes and the Valve means, and 1ndicat1ng'meaI1STlocated adjacent the valve casing for indicating the degree at which it is desired to maintain the oven.

4. In a device of the character described adapted for application to a gas range having an oven and -a stringer pipe on the outside thereof, the combination-with a valve casing adapted for connection with the stringer pipe to receive support therefrom,

valve means in the casing, heat sensitive means located within the oven, an actuating connection between the heat sensitive means and the valve means, means for adjusting gree, andindicating means located adjacent temperature at which it is desired to maintain the oven.

5. In adevice of the character described adapted for application to a gas range having an oven and a stringer pipe on the outside thereof, the combination with a valve casing adapted for connection with the stringer pipe to receive support therefrom,

valve means in the casing, heat sensitive means located within the oven, an actuating connection between the heat sensitive means andthe valve means, means for adjusting the valve mean whereby the oven temperature is maintained at a predetermlned degree,

.and indicating means mounted at the valve casing and including pointing means and graduated dial means, one of said last two mentioned means being movable with the valve adjusting means to indicate the temperature at which it is desired to maintain the oven.

6. 111a device of the character described adapted for application to a gas range having an oven and a stringer pipe on the outside thereof, the combination With a valve casing adapted for connection with the stringer pipe to receive support therefrom, valve means in the casing, heat sensitive means located within the oven, an actuating connection between the heat sensitive means and the valve means, means for adjusting the valve means whereby the oven'temperature is maintained at a predetermined degree, and means supported from the valve casing and movable with the valve adjusts ing means to indicate the temperature at which it is desired to'maintain the oven.

7. In a device of the class described, the combination with a heating compartment and means for heating the same, of a control device for governing the temperature of said compartment, said control device including a heat responsive rod, a shaft rotatably mounted upon one wall of the compartment and l 1aving its intermediate 'portion of larger diameter than its ends, a connection between one end of said shaft and said heating means, and means connecting the other end of said shaft with said rod whereby a contraction or expansion of said rod will rotate said shaft and operate the heating means without any torsional twist in said shaft.

8. In a device of the class described the combination of a heating compartment and means for heating the same, of a control device lor governing the temperature of said compartment, said control device including a heat sensitive rod, a channel bar mounted upon one wall of the compartment, a shaft rotatably mounted between brackets carried by said bar, a connection between said shaft and rod whereby a contraction or expansion of said rod will rotate the shaft, and a connection between said shaft and heating means for controlling the-same.

9. In a device of the class described, the combination with a heating compartment and means for heating the same, of a control device comprising a heat sensitive rod secured to an inner wall of said compartment, means connecting said rod with the heating means whereby a contraction or expansion of said rod will diminish or increase the heat given off by said heating means, and radiatingfins formed integrally with one wall of the compartment and exteriorly thereof adjacent said rod.

10. In a device of the class described, the

combination with a heating compartment and means for heatlng the same of a control device, comprislng a heat sensitive rod secured to an inner wall of said compartment, means connecting said rod with the heating means-whereby a contraction or expansion of said rod will diminish or increase the heat given off by said heating means, and radiating fins on the outer face of the wall adjacent said rod, said fins being sub-' staintially parallel and slightly above said ro 11. In a gas range having a burner section and an oven compartment located at one end thereof, a burner gas supplying stringer pipe extending along the burner section and terminating adjacent the oven compartment and oven heating means adapted to receive fuel supply from the stringer pipe at the end thereof adjacent the oven compartment, a valve casing connectible with the end of the stringer pipe adjacent the oven compartment to receive support therefrom and through which the gas for the ovenheating means flows, valve means in the casing, heat sensitive means located within the oven, a movable rod extended along one wall of the compartment, an operating connection between one end of the rod and the valve means, and means engaging the other end of said rod with the heat sensitive means whereby the response of the heat sensitive means to temperature changes operates the valve means through said rod.

12. In a gas range having a burner section and an oven compartment located at one end thereof, a burner gas supplying Stringer pipe extending alongithe burner section and terminating'adjacent the oven compartment and oven burner means adapted to receive fuel supply from the stringer pipe at the end thereof adjacent the oven compartment, a valve casing connectible with the end of the stringer pipe adjacent the oven compartment to receive support therefrom, valve means in the casing, heat sensitive means located within the oven, an actuating connection between the heat sensitive means and the valve means. means for eaawe 5 adjusting the valve means whereby theoven In testimony that we claim the foregoing temperature is maintained at a predeterwe have hereunto set our hands at Milwauv mined degree, and indicating means located kee, in the county of Milwaukee and State 10 adjacent the valve casing and operable by of Wisconsin.- 7

i the adjustment of the valve means to indicate the vtemperature at which it is desired EMIL L. CLAUS. to maintain the oven. WALTER E. OLAUS. 

